Information Disclosure Vulnerability in Microsoft Office Word
CVE-2026-40421

4.3MEDIUM

Key Information:

Vendor: Microsoft
Status: Microsoft 365 Apps For Enterprise; Microsoft Office 2019; Microsoft Office Ltsc 2021; Microsoft Office Ltsc 2024
Vendor: CVE Published:; 12 May 2026

What is CVE-2026-40421?

An information disclosure vulnerability in Microsoft Office Word allows unauthorized attackers to control file names or paths. This could enable attackers to disclose sensitive information over a network, potentially compromising user data. It is crucial for users to apply the latest updates to mitigate the risk associated with this vulnerability.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office LTSC 2021 32-bit Systems 16.0.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...

vendor-advisorypatch

CVSS V3.1

Score:

4.3

Severity:

MEDIUM

Confidentiality:

Low

Integrity:

None

Availability:

Low

Attack Vector:

Network

Attack Complexity:

Low

Privileges Required:

None

User Interaction:

Required

Scope:

Unchanged

Download the Critical Vulnerability Management Cheat Sheet

Timeline

Vulnerability published
May 12, 2026
Vulnerability Reserved
Apr 13, 2026

CVE-2026-40421 Data

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